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用两块集成电路就可组成一种简单而实用的单片机自动复位电路.其原理线路如图1所示。图中,IC_1 与R_1、C_1组成单稳态电路,R_1、C_1为其定时电阻、电容。IC_2与T、R_2、R_3、C_2等元件组成产生复位脉冲的逻辑电路。该电路初次上电时,由于电源电压V_cc 经R_3、R_4对C_2充电,使得A 点电位从零按指数规律上升到电源电压,因此在B
With two integrated circuits can be composed of a simple and practical single-chip automatic reset circuit. The principle of the circuit shown in Figure 1. In the picture, IC_1 and R_1, C_1 make up the monostable circuit, R_1, C_1 are its regular resistance, electric capacity. IC_2 and T, R_2, R_3, C_2 and other components to generate a reset pulse logic circuit. When the circuit is first powered on, since the power voltage V_cc is charged to C_2 via R_3 and R_4, the potential at point A rises from zero to the power supply voltage exponentially, and therefore, at B